Lighting system for power tables



I. D. KARLE. LIGHTING SYSTEM-FOR POWER TABLES.

APPLICATION FILED MAY 5|v i919.

NEY

EINVENTStI J. D. vKARLE. LIGHTING SYSTEM FOR POWER TABLES.

APPLICATION FILED MAY 5. l9l9.

Patented May 9, 1922.

3 SHEETS-SHEET 2- INVENTiR/ l lu BW' ATTORNEY I. D. KARLE. LIGHTING SYSTEM FOB POWER TABLES.

APPLICATION FILED MA`Y5| ISIS.

' Patented May 9, 1922.

3 SHEETS-SHEET 3.

ATTORNEY unirsi); STATES `e orties.

JOHN D. KARLE, or ROSELLE PARK, NEW JERSEY, AssIGNo-R To THE SINGER MANU- EACTURING ooMPANYfA CORPORATION or NEW JERSEY. v

- LIGHTING SYSTEM EoR POWER TABLES.

Specification of Letters Patent. y y patented' lay 9A, i922 Application inea May 5, 191e. Serial No. 295,012.

TQ all whom it may concern:

l 3e it known that I, JOHN D. K ARLE, a citizen of the Unitedr States, residing at Roselle vlfarlginthe county of Union and State are :to be operated in groupsit is customary to pla-ce the machines in rows at opposite sides of long power tables and belt. them up to suitable treadle-controlled power-transmission devices which receive power from "line-shaftsy extending lengthwise of and be.

, -iieaththe' power-tables.

"Inorder that highquality production may Vbe S`e'cured,' it is desirable that plenty of l lightbe supplied 'the Voperatives in order l.thattlfiey.may quickly and accurately present they work to the machines .andnproperly v,guide thework duringtthe s ewingor other operations.,` While ran abundance of daylightvis, l of course, to .be preferred, it fre-Y quently happensthat the installations must,

,by force of circumstances, be so located that sufficient day-light is l.notavailable and.

"again, lwhile manyinstallationmay havev -sutticient natural 'light on clear days, it often happens that suchv light is insuiiicient on 4cloudy days, particularly during the latter Q .part of such days.l *Eon these reasons vari- -ous; artiiicialcllghtlng -systems have I`been proposed and used.- Manywof these systems','

s Others are, j ineiicient for the reason. that thelight .is

however,` are costly' to install.`

not supplied .where it' isymost wanted and I 401th@ resulting shadows are annoying.. j' l. 'llhe present lighting vsystem is designed Vto, o vercome theiabove andl other defects .of

' lightingsystems heretofore used and'wto provide vmeans lwhereby each ofthe operatives supplied.- with Lanz. individual lightingunit' k `v vhichinaybe quicklyand conveniently ad-V liusted to efficiently and'accurately direct the 'I "light upon the work, without lspreading the .Mllightwheijeit is .not needed or desiredl l"f FurtherA objects. ofthe invention will ap-V 1 from.- the following rcvlpescription 1 and claims. 1

*n its preferred embodiment, `.the present gsilv'st-emnssts of@ Series 0f Standards Supported'b'y'and centrally of the power=table In factory installations where numerous small machines, suoli as sewing machines,V

,the central' part lof thertable-top where the ,finished work accumulates. 1

' vention.' tFig. 2 is arplan'view the'same; s :Fig "3 is a cross-section of' thel table )as 'seen and carrying a horizontally disposed conduit for the lighting circuit. The.. length .of conduit between aIV givenk pair of adjacent standards is providedwith an outlet box 1 f in which oppositely disposed .receptacles are 60. mounted 'foi-,supplying the electric currentv to a pair o f liglitingfxtures which are prefeijably clamped to the-,conduit fat opposite 'sides .ofthe outletA anduextend. in opposite,- directions toward the machines to be illu?.

.minated Each of ythe lightingxtures comprises aiiXed-arm rigidly secured to the conduit and a vinovable'arm carried by the f fixed arm and terminating inalainp socket,l carrying a suitable shadey andincandescent '10 flamp.. A featureY of the inyention' is the provision of a frictionzhinge orgpiyotal connection between the .fixed `and moyable arms,

permitting the latter arm toloe` readilyele. vatedy whendesired, andaseasilylowered to operative position. Another-feature' of the invention is theadjustable mounting'wof the movable larin ina socket` which gis parallel to or substantially coincident with the transverse *vertical plane throughthe stitch! ving point .of the vcorrespondingmachine. [whereby said arm` may be turned in said socket to zdirect theilightto the stitching "point, either from theright` or' from@ the...v

left",A as best .meets .the k requirements ofr the.

4'particular stitching operation inA process.

rllhe main conduitr also. forms la 'convenient tsupport `for spooldiolding and thread-guidl inglXtures, which are thus held lclear 4of.

n 9o Inthe accompanying drawings, Fig. lis: aside elevation of one .of a serie'suofzs'himi'lar Sections/of a power-table embodying the in-w fromI the rightofFig. 1. Fig 4i is .aisection `.o'nthe linee, il, Fig. 3. Fig.' .isasection 4ou the rline 5,V tFig. l and Figi?) Iis a seo-` tml View" 0f 011e. f JCh"Socketed'inelii'bers` 10o usedA for supporting th@JV spoophpldingand thread-guiding fixtures', j

In the preferred embodiment ofiftheirivenwtion, the lighting system is shown' as'carried .I y

by apower table lconstructed in accordance" with the`disclosure of the U. S. patent application of O.. L'. Dosch, SerialfNoYl 31,083,

los

filed 4June 6,1'19v-,l75'iand comprisingatable-l fdp l which. S Carried by Suitable transverse..

rails'Q arranged in pairs to form housings 110 y section of the power-table.

for the transmitters 3 which receive power from the line-shaft s extending longitudinally of the table, below the level of the table-top 1 and within the work receiving trough t. The rails 2 are carried by suitable legs 4, 4 of. a length sutiicient to support the table-top 1 at a height convenient 'for the operatives of the machines 5, 5 which are arranged in rows at opposite sides of the tabletop and belted to the transmitters 3 in the usual manner.

Secured to the table-top 1 and rails 2, centrally of the latter, are the standards 6, 6 carrying the horizontal main conduit 7 encasing the electric wires 8 constituting the lighting circuit. An .inlet box 9 is provided at one end of the conduit 7 for reception of the plugl() ot the supply circuit 11. The length of conduit 7, between a pair of standards 6 ofrone section of the table, inchicles an outlet box 12 having a central web 13 against the opposite faces of which are secured the bases 14 of suitable current taps having oppositely directed sockets 15 for reception of the plugs 16 leading to the lighting fixtures to be described.

Clamped to the conduit 7 at opposite sides of the outlet box 12, are the split socketed extremities 17 of the oppositely directed. iixed arms 18 of a for the machines 5, 5 of the corresponding As these lighting iixtures are of similar construction, a description of one will suiiice. The arm 18 of one of these fixtures is formed with a disk-like free extremity7 19 having an annular friction surface 20, Fig. 4, disposed in a plane at right angles to the conduit 7. Within the friction surface 20 is a clearance depression 21 centrally of which and parallel with the conduit 7 is an aperture 22 forming a bearing :for the cylindrical pin 23 having a disk-like head 24 lwhich is formed-with a friction surface 25 and depression 26 similar to and parallel with the surface 20 and depression 2l of the disk 19. The bearing aperture 22 is enlarged at 27 for reception of the compression spring 28 which surrounds the pin 23 and presses outwardly against' the washer 29 held on the pin 23 by a Cotter-pin 30. The spring 28 thus acts to yieldingly force the Ymovable disk 24 toward the fixed disk 19. Between the disks 24 and 19 a washer y31 of suitable wear resisting material such as leather, is

, interposed. The spring 28 is relatively stili' and is under suiiicient compression to draw the disk 24 snugly against the friction washer 31.

' They movable-disk 24 is formed centrally of its exposed face with a boss 32 which is .formed with. an aperture 33 parallel with .the surface 25, for reception of one exy tremity of the tubular arm 34, fthe o posite extremity of which is off-set a consi erable pair of lighting fixturesdistance from the plane of the friction surface 25 and from the vertical plane through the axis of the aperture 33. More speciically, the arin 34 isbent substantially to the form of the letter S or, in other words, is given a reverse curve, in order that the usual lighting socket 35 lamp 35 and shade 35 which are carried at the free extremity of said arm, may be off-set from the transverse vertical plane P-P through the stitching point of the corresponding machine, and may be directed toward said stitching point, as shown in Figs. 1 and 2. The arm 34 is held in adjusted position in the aperture 33 by means of the set-screw 36..

For stitching certain classes of work it is desirable that the light be directed to the stitching point from the left, as shown in. full lines in Figs. 1 and 2. W'ith certain other classes of work, however, the light.

should preferably come `from the right, as shown in dotted lines in said figures, and it will bc readily understood that by loosening the set-screw 36, the arm 34y may be quickly swung from one to the other ofv these positions. A l

When the light 35 isnot being used,the

arm 34 may be swungupwardly about the pin 23 as an axis, Fig. When it is again desired to use the light it may be instantly,

restored to correct operativeposition, which position it will hold indefinitely notwithstanding possible vibration to which it 4may be subjected.

The provision of the conduit 7 atv the longitudinal center of the table-top 1, 'affords a' convenient support for the spool-holding and thread-guiding fixtures 37, 38 fixed respectively, in the downwardly and upwardly directed sockets 39, 40, Fig. 6,01? a pairof similar clamping sections 41, 42 secured` together in gripping relation with the conduit 7 by means `of screwsk 43. It is to be noted that the clamping Sections 41,42, as well as the arms 18 of the lighting fixtures, may be adjusted to any desired position longitudi# nally of or angularly about the conduit 7.

Having thus set forth the nature of the invention, what l claim hereinisz- 1. In a lighting system for sewing machine power-tables, a lighting unit including a fixed arm and a movable varm frictionally pivoted at the free end of said fixed -arm :to swing verticallygsaid movable arm includinn; a support having a socket extending parf allel to and closely adjacent the transverse vertical plane through the stitchingpoint of the sewing machine `to be illuminated,- an arm ,proper adjustably mounted..in.said

socket and having its extremity offsettrom` Vilo provided at one end with means adapting it to be detachably clamped upon a supporting conduit, said arm being formed at its opposite end with a raised annular surface disposed ina plane substantially parallel with said arm and surrounding a clearance depression, said arm beingy 'further formed with a .bearing aperture centrally of'said depression and at right angles to said surface, a complemental member having a similar surface and a central pin entering said bearing aperture, a ring of relatively soft friction material between said surfaces, a spring device forv forcing said surfaces into clamping relation lwith said ring, and an arm mounted in said complemental member and carrying a lighting element at its free end.

3. In a lighting system for powertables, in combination, a support, a xed arm carried by said support and having at its extremityv an annular surface disposed in a verticalI plane and a` bearing aperture centrally of and at right angles to said surface, a complemental member having a similar surface and a central pin entering said bearing aperture, a ring of relativelysoft friction material between said surfaces, a spring de'- vice for drawing said surfaces into engagement with said ring, an arm mounted in said complemental member Jfor adjustment about an axis vparallel'with said surfaces,

and a lighting element carried at the free end of said arm, said arm being bent to the yform ofl a reverse curve to oiset said lighting element from the axis offadjustment thereof, thereby permitting the lightto .be

directed inwardly, from either side, toward a vertical plane passing through said axis.V

Intestimony whereof, I have signed my nameto 'this speciiication. v JOHN D. KARLE. 

